On strain-rate and inertia effects of concrete samples under impact

YUAN Liangzhu; MIAO Chunhe; SHAN Junfang; WANG Pengfei; XU Songlin

doi:10.11883/bzycj-2021-0114

Volume 42 Issue 1

Jan. 2022

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Article Navigation > Explosion And Shock Waves > 2022 > 42(1): 013101

YUAN Liangzhu, MIAO Chunhe, SHAN Junfang, WANG Pengfei, XU Songlin. On strain-rate and inertia effects of concrete samples under impact[J]. Explosion And Shock Waves, 2022, 42(1): 013101. doi: 10.11883/bzycj-2021-0114

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YUAN Liangzhu, MIAO Chunhe, SHAN Junfang, WANG Pengfei, XU Songlin. On strain-rate and inertia effects of concrete samples under impact[J]. Explosion And Shock Waves, 2022, 42(1): 013101. doi: 10.11883/bzycj-2021-0114

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On strain-rate and inertia effects of concrete samples under impact

doi: 10.11883/bzycj-2021-0114

1.
CAS Key Laboratory for Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei 230027, Anhui, China
2.
United Laboratory of High-Pressure Physics and Earthquake Science, Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China

Received Date: 2021-04-01
Rev Recd Date: 2021-06-02

Available Online: 2021-12-02

Publish Date: 2022-01-20

Abstract

Abstract

Based on the dynamic experimental results of concrete specimens under true triaxial confinement, the Holmquist-Johnson-Cook (HJC) model considering the strain rate effect and the Drucker-Prager (DP) model considering the hydrostatic pressure effect were employed for numerical analysis to explore the methods for studying the strain rate effects and inertia effects. In order to explore the relationship between the strain rate effect and the lateral inertia effect of concrete, the numerical simulation results of the HJC model were used to fit the parameters of the DP criterion, and the values of the parameters α and k at four strain rates were obtained. The relationship between the DP criterion parameters and the strain rate and hydrostatic pressure was comprehensively analyzed. The results of numerical analysis show that with the increase of strain rate, the strength of concrete increases, and this strength increase is partly due to the increase of the first stress invariant I₁. It can be concluded that the strain rate and lateral inertia constraint of concrete specimens have a strong coupling effect. The relationship between the distribution characteristics of the transverse stress and the strain rate, hydrostatic pressure and specimen size under impact are analyzed theoretically and numerically. The results show that the amplitude of the transverse stress increases with the strain rate and hydrostatic pressure, but decreases with the sample size. In order to investigate the effect of lateral inertia on the strength improvement, a parameter ξ related to the maximum stress σ_xand the equivalent stress σ_e in the impact direction, defined as ξ=(σ_x−σ_e)/σ_x, was proposed. The relationship between the strain rate, hydrostatic pressure, specimen size and the parameter ξ was analyzed by the HJC model. It is found that this parameter has evident size effect, strain rate effect and hydrostatic pressure effect. However, the relationship between the parameter ξ and the stress triaxiality shows a strain rate independent characteristic. It can provide a new way for the investigation of strain rate effect.
- impact dynamics,
- concrete,
- strain rate effect,
- inertia effect,
- stress triaxiality

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References

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